SMemo on Kitkat 4.4.2

I had a lot of .snb file (SMemo file) on my S4, but the rom that i installed has "SNote" and doesn't read .snb file... but my principal question is: On ORIGINAL 4.4.2 KitKat Samsung's Firmware there is SMemo or SNote? Because i think that SNote is a porting but i don't manage to find a rom KitKat with SMemo and the original Firmware from SamMobile is a .md5 file and when i open it with BetterZip i don't find any app like the normal rom that i download from xda..
I tried to install the old SecNote2.apk but it fc when i open it...

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